*{
	margin: 0;
	padding: 0;
}
.advertising{
	position: fixed;
	top: 30px;
	background-color: #fff;
	height: 30px;
	width: 100%;
	line-height: 25px;
	text-align: center;
	border-top: 1px #DBDBDB solid;;
	border-bottom: 1px #DBDBDB solid;

}
.content{
	margin-top: 60px;
	height: 1000px;
}
.content img{
	width: 100%;
	margin: 0;
}
/* 尺寸  width>=1200px     大型屏幕 */
@media only screen and (min-width:1200px ) {
}
/* 尺寸 width>=992px   中等屏幕 */
@media only screen and (min-width:992px) and (max-width:1199px) {
}
/* 尺寸               小屏幕*/
@media only screen and (min-width: 768px) and (max-width: 991px) {
}
/*尺寸    超小屏幕*/
@media only screen and (min-width: 0) and (max-width: 767px) {
}



















































































































































































